Your apartment’s relative humidity should stay in the range of 30 to 40%. It should never exceed 45% because then there’s the chance of humidity damage to the building – and the growth of mould and mildew in your apartment, a serious health risk. On the other hand, if the air is too dry, it may cause symptoms in asthmatic and allergic people. Leanheat measures both the temperature and the humidity in your apartment. If it detects values above optimal, the system automatically alerts a maintenance team about the matter.